Update build script to generate Bundles in addition to APKs.
Update build script to generate Bundles in addition to APKs.

Change-Id: Ibe1f37307f0f812bcfb7951b494efe1828377a3f

wikimedia/apps-android-wikipedia,wikimedia/apps-android-wikipedia,dbrant/apps-android-wikipedia,wikimedia/apps-android-wikipedia,dbrant/apps-android-wikipedia,dbrant/apps-android-wikipedia,dbrant/apps-android-wikipedia,dbrant/apps-android-wikipedia,wikimedia/apps-android-wikipedia